Wilks Score Calculator

How it is calculated

The Wilks score rescales a lifted total so lifters of different bodyweights can be compared. A coefficient is found from a fifth-degree polynomial of bodyweight x (in kg): denominator = a + b·x + c·x2 + d·x3 + e·x4 + f·x5, then coefficient = 500 / denominator and score = coefficient × lifted. The six constants differ for men and women; the tool uses the female set only when sex is set to female, otherwise the male set. The lifted weight should be in the same unit as bodyweight (kg). The score is shown to two decimals and the coefficient to four. Bodyweight must be above zero.

Common mistakes

• Entering bodyweight in pounds while the polynomial expects kilograms, which gives a meaningless coefficient.
• Entering a single lift (such as the squat) instead of the competition total of squat, bench and deadlift.
• Leaving sex on male for a female lifter; the two sets of constants give clearly different coefficients.
• Mixing units: a total in pounds and a bodyweight in kilograms.